Three hikers die at Grand Canyon National Park in Arizona in separate incidents that park officials say appear to be related to extreme heat. Authorities report that the deaths occur while the hikers are on or traveling through canyon areas during periods of very high temperatures, which peak above 100 degrees Fahrenheit. Officials describe the circumstances as “suspected” or “apparent” heat-related illness, consistent with conditions the park warns about during the hottest parts of the day. Reports indicate that response efforts include rapid action and, in at least one case, aerial support, but the hikers are found dead by the time first responders reach them. In the wake of the fatalities, Grand Canyon National Park issues public guidance to avoid hiking during peak heat hours, including a warning for visitors to stay off inner-canyon trails during late morning through mid-afternoon. Additional warnings are also issued about extreme heat expected again in the coming days. The National Park Service urges people to plan for heat exposure, carry water, and follow posted safety recommendations as conditions remain hazardous.